doc: add a few http items to go1.4.txt

CC=golang-codereviews
https://golang.org/cl/132670045

doc/go1.4.txt

@@ -17,6 +17,9 @@ crypto/tls: add support for ALPN (RFC 7301) (CL 108710046)
 crypto/tls: support programmatic selection of server certificates (CL 107400043)
 encoding/gob: remove unsafe (CL 102680045)
 misc: deleted editor support; refer to https://code.google.com/p/go-wiki/wiki/IDEsAndTextEditorPlugins instead (CL 105470043)
+net/http: add Request.BasicAuth method (CL 76540043)
+net/http: add Transport.DialTLS hook (CL 137940043)
+net/http/httputil: add ReverseProxy.ErrorLog (CL 132750043)
 os: implement symlink support for windows (CL 86160044)
 runtime: implement monotonic clocks on windows (CL 108700045)
 runtime/race: freebsd is supported (CL 107270043)